This bug is awaiting verification that the linux-ibm/6.8.0-1006.6 kernel
in -proposed solves the problem. Please test the kernel and update this
bug with the results. If the problem is solved, change the tag
'verification-needed-noble-linux-ibm' to 'verification-done-noble-linux-
ibm'. If the problem still exists, change the tag 'verification-needed-
noble-linux-ibm' to 'verification-failed-noble-linux-ibm'.
If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!
** Tags added: kernel-spammed-noble-linux-ibm-v2 verification-needed-noble-linux-ibm
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https://bugs.launchpad.net/bugs/2049793
Title:
[MTL] x86: Fix Cache info sysfs is not populated
Status in intel:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Noble:
Fix Released
Bug description:
[SRU Justification]
[Impact]
The interface /sys/devices/system/cpu/cpuX/cache is broken (not populated) if
CPUs have different numbers of subleaves in CPUID 4. This is the case of Intel
Meteor Lake.
[Fix]
https://lore.kernel.org/all/20231212222519.12834-1-ricardo.neri-calderon@linux.intel.com/
Reviewed, but probably will only land in v6.9.
[Test Case]
Check existence of cpu cache info:
$ ls /sys/devices/system/cpu/cpu0/cache/
index0 index1 index2 index3 uevent
[Where problems could occur]
This populates sysfs entries that should have been available, not
something new or alters existing interface.
[Other Info]
While this is targets v6.8 for Intel LPMD (Low Power Model Daemon)'s
use, only Noble and Unstable will be nominated for fix.
========== original bug report ==========
[Description]
The interface /sys/devices/system/cpu/cpu*/cache is empty. In Meteorlake, not all CPUs have the same number of subleaves in the CPUID 4 leaf. The compute die CPUs have 3 subleaves whereas the CPUs in the SoC die have 2. This problem happens because Linux assumes that all CPUs have the same number of subleaves.
[Hardware Information]
Architecture:
Intel / AMD (x86_64)
Platform(s):
Meteor Lake
Date HW is expected at Canonical:
Component(s):
x86
[Software Information]
Target Version:
24.04
Target Kernel:
6.8
Commit IDs:
TBD
External Links:
https://lore.kernel.org/all/20231212222519.12834-5-ricardo.neri-calderon@linux.intel.com/
[Business Justification]
[Testing guidance]
[External ID]
LFE-6901
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